Standardize usage of virtual/override/final in gpu/

gpu/command_buffer/service/transfer_buffer_manager_unittest.cc

Index: gpu/command_buffer/service/transfer_buffer_manager_unittest.cc
diff --git a/gpu/command_buffer/service/transfer_buffer_manager_unittest.cc b/gpu/command_buffer/service/transfer_buffer_manager_unittest.cc
index 44d084055f6734e202c36730ffd5544d082ca8ee..563b6cb7ccde2f9f5f63a9cf3d3a121f54387f0e 100644
--- a/gpu/command_buffer/service/transfer_buffer_manager_unittest.cc
+++ b/gpu/command_buffer/service/transfer_buffer_manager_unittest.cc
@@ -57,10 +57,10 @@ TEST_F(TransferBufferManagerTest, CanRegisterTransferBuffer) {
 
 class FakeBufferBacking : public BufferBacking {
  public:
-  virtual void* GetMemory() const override {
+  void* GetMemory() const override {
     return reinterpret_cast<void*>(0xBADF00D0);
   }
-  virtual size_t GetSize() const override { return 42; }
+  size_t GetSize() const override { return 42; }
   static scoped_ptr<BufferBacking> Make() {
     return scoped_ptr<BufferBacking>(new FakeBufferBacking);
   }